(NSFW) Can you speak sex talk?

Although I am somewhat a nympho I feel I struggle to say sexy things during any sexual act.

My boyfriend likes me to say sexual things to him sometimes,during sex and in my head I have no problem, but to actually say things, I really struggle.

I don’t know why I am like it and I know exactly what to say, just can’t seem to get the words out. I can say I love you and things like that, but all the naughty stuff, I can’t seem to get out.

Any ideas?